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Lycopene-Family Carotenoids Confer Thermostability on Photocomplexes from a New Thermophilic Purple Bacterium. | LitMetric
is a newly described thermophilic purple bacterium containing bacteriochlorophyll . Using purified light-harvesting 1 reaction center (LH1-RC) core complexes from . , we compared the biochemical, spectroscopic, and thermal denaturation properties of these complexes with those of its mesophilic counterpart, . Besides their growth temperature optima, a striking difference between the two species was seen in the carotenoid composition of their LH1-RC complexes. The more thermostable . complex contained more carotenoids with longer conjugation lengths ( > 9), such as lycopenes ( = 11), and had a total carotenoid content significantly higher than that of the complex, irrespective of the light intensity used for growth. The thermostability of LH1-RCs from both and decreased significantly in cells grown in the presence of diphenylamine, a compound that inhibits the formation of highly conjugated carotenoids. In contrast to the thermophilic purple bacterium , where Ca is essential for LH1-RC thermostability, Ca neither was present in nor had any effect on the thermostability of the . LH1-RC. These results point to a mechanism that carotenoids with elongated conjugations enhance hydrophobic interactions with proteins in the LH1-RC, thereby allowing the complexes to withstand thermal denaturation. This conclusion is bolstered by a structural model of the LH1-RC and is the first example of photocomplex thermostability being linked to a carotenoid-based mechanism.
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